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1.中国矿业大学力学与土木工程学院,江苏 徐州 221116
2.中国矿业大学深部岩土力学与地下工程国家重点实验室, 江苏 徐州 221116
3.中国矿业大学国际学院,江苏 徐州 221116
Received:23 March 2020,
Revised:2020-06-11,
Online First:03 November 2020,
Published:05 November 2020
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丛健, 高蓬辉, 张东海, 周晋鹏, 张正函. 超声波对液滴冻结状态及传热的影响[J]. 化工学报, 2020, 71(11): 5117-5128
CONG Jian, GAO Penghui, ZHANG Donghai, ZHOU Jinpeng, ZHANG Zhenghan. Effect of ultrasonic on freezing state and heat transfer of droplet[J]. CIESC Journal, 2020, 71(11): 5117-5128
丛健, 高蓬辉, 张东海, 周晋鹏, 张正函. 超声波对液滴冻结状态及传热的影响[J]. 化工学报, 2020, 71(11): 5117-5128 DOI: 10.11949/0438-1157.20200301.
CONG Jian, GAO Penghui, ZHANG Donghai, ZHOU Jinpeng, ZHANG Zhenghan. Effect of ultrasonic on freezing state and heat transfer of droplet[J]. CIESC Journal, 2020, 71(11): 5117-5128 DOI: 10.11949/0438-1157.20200301.
超声波辅助冻结在食品、医疗及生物化学等领域得到了广泛的应用,为了明确超声波对溶液冻结过程中液固比例、孔隙率的影响,揭示冻结过程中热量的传递规律,在液滴冻结状态实验观测的基础上,结合声学及热质传递理论,建立了超声波液滴冻结理论模型,分析了超声波对液滴冻结状态的影响,比较了超声空化效应所引起的传质散热量和超声热效应引起的产热量的大小关系。结果表明:超声波有助于液滴表面的气泡逸出,气泡逸出率越大冻结过程中液固比例越小;当气泡逸出率一定时,液滴越小冻结过程中的孔隙率越大;超声波一定时,逸出率越小冻结过程中的孔隙率越大;对于冷却冻结过程,不同频率和强度的超声波存在合理的超声波加载时间。
Ultrasonic -assisted freezing has been widely used in food
medical and biochemical fields. To clarify the effect of ultrasonic wave on the variations of liquid-solid ratio and void ratio in freezing state
and to reveal heat transfer law in the process of freezing transformation
the mathematical model of ultrasonic droplet freezing was established which was combined with the theory of acoustics and heat & mass transfer based on the experiment. The droplet freezing state under the action of ultrasound was analyzed
and the heat dissipation caused by ultrasonic cavitation effect and heat production caused by ultrasonic thermal effect was compared. The result shows that the ultrasonic wave is helpful to bubble overflow on surface of the droplet
and the larger the overflow rate is
the smaller the liquid-solid ratio is in the freezing process; when the bubble overflows is certain
the smaller the droplet is
the larger the porosity is; when the ultrasonic wave is certain
the smaller the overflow rate is
the larger the porosity is in the freezing process; for the cooling and freezing process
there is a reasonable ultrasonic loading time for different ultrasound frequencies and intensities.
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